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We bend them, kneel on them, run and jump on them daily, yet few of us give them a second thought. Knees. They're one of the most complex and most injury prone joints in your body. Why? Blame the knee's design. Unlike the more stable hip joint, which is a ball in a deeply cushioned pocket, the knee joint is more exposed and more vulnerable. Essentially, the knee is a rounded bone that rests on a relatively flat one. The thighbone (femur) ends in two rounded knobs (condyles),